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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '035dafb039c15c85d1533d53466879a21cf6384fa18924ac8658c6150a5c08b7' 
  AND token = 'fxp6DDONqTK1A/2+7mzexUN97IaM1hygVYvO2SEteqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}